import asyncio
import logging
import math
import re

from redis.asyncio import Redis
from thefuzz import fuzz

from db.config import settings
from db.models import TorrentStreams, TVStreams
from db.schemas import Stream, UserData
from streaming_providers import mapper
from utils import const
from utils.const import STREAMING_PROVIDERS_SHORT_NAMES
from utils.runtime_const import ADULT_CONTENT_KEYWORDS, TRACKERS
from utils.validation_helper import validate_m3u8_url_with_cache


async def filter_and_sort_streams(
    streams: list[TorrentStreams], user_data: UserData, user_ip: str | None = None
) -> list[TorrentStreams]:
    # Convert to sets for faster lookups
    selected_catalogs_set = set(user_data.selected_catalogs)
    selected_resolutions_set = set(user_data.selected_resolutions)

    # Step 1: Filter streams by selected catalogs, resolutions, and size
    filtered_streams = [
        stream
        for stream in streams
        if any(catalog_id in selected_catalogs_set for catalog_id in stream.catalog)
        and stream.resolution in selected_resolutions_set
        and stream.size <= user_data.max_size
    ]

    if not filtered_streams:
        return []

    # Step 2: Update cache status based on provider
    if user_data.streaming_provider:
        cache_update_function = mapper.CACHE_UPDATE_FUNCTIONS.get(
            user_data.streaming_provider.service
        )
        kwargs = dict(streams=filtered_streams, user_data=user_data, user_ip=user_ip)
        if cache_update_function:
            try:
                if asyncio.iscoroutinefunction(cache_update_function):
                    await cache_update_function(**kwargs)
                else:
                    await asyncio.to_thread(cache_update_function, **kwargs)
            except Exception as error:
                logging.error(
                    f"Failed to update cache status for {user_data.streaming_provider.service}: {error}"
                )

    # Step 3: Dynamically sort streams based on user preferences
    def dynamic_sort_key(stream):
        # Compute sort key values only once per stream
        sort_key_values = {
            sort_key: (
                getattr(stream, sort_key)
                if getattr(stream, sort_key) is not None
                else 0
            )
            for sort_key in user_data.torrent_sorting_priority
        }

        # Create the sort tuple, using resolution ranking for resolution sorting
        return tuple(
            const.RESOLUTION_RANKING[stream.resolution]
            if sort_key == "resolution"
            else sort_key_values[sort_key]
            for sort_key in user_data.torrent_sorting_priority
        )

    dynamically_sorted_streams = sorted(
        filtered_streams, key=dynamic_sort_key, reverse=True
    )

    # Step 4: Limit streams per resolution based on user preference, after dynamic sorting
    limited_streams = []
    streams_count_per_resolution = {}
    for stream in dynamically_sorted_streams:
        count = streams_count_per_resolution.get(stream.resolution, 0)
        if count < user_data.max_streams_per_resolution:
            limited_streams.append(stream)
            streams_count_per_resolution[stream.resolution] = count + 1

    return limited_streams


async def parse_stream_data(
    streams: list[TorrentStreams],
    user_data: UserData,
    secret_str: str,
    season: int = None,
    episode: int = None,
    user_ip: str | None = None,
) -> list[Stream]:
    stream_list = []
    streams = await filter_and_sort_streams(streams, user_data, user_ip)

    # Compute values that do not change per iteration outside the loop
    show_full_torrent_name = user_data.show_full_torrent_name
    streaming_provider_name = (
        STREAMING_PROVIDERS_SHORT_NAMES.get(user_data.streaming_provider.service)
        if user_data.streaming_provider
        else "P2P"
    )

    has_streaming_provider = user_data.streaming_provider is not None
    base_proxy_url_template = (
        f"{settings.host_url}/streaming_provider/{secret_str}/stream?info_hash={{}}"
        if has_streaming_provider
        else None
    )

    for stream_data in streams:
        episode_data = stream_data.get_episode(season, episode)

        if episode_data:
            file_name = episode_data.filename
            file_index = episode_data.file_index
        else:
            file_name = stream_data.filename
            file_index = stream_data.file_index

        if show_full_torrent_name:
            torrent_name = (
                f"{stream_data.torrent_name}/{episode_data.title or episode_data.filename or ''}"
                if episode_data
                else stream_data.torrent_name
            )
            torrent_name = "📂 " + torrent_name.replace(".torrent", "").replace(".", " ")
        else:
            torrent_name = None

        quality_detail_parts = [
            ("📺 " + stream_data.quality) if stream_data.quality else None,
            ("🎞️ " + stream_data.codec) if stream_data.codec else None,
            ("🎵 " + stream_data.audio) if stream_data.audio else None,
        ]
        quality_detail = " ".join(filter(None, quality_detail_parts))

        resolution = stream_data.resolution.upper() if stream_data.resolution else "N/A"
        streaming_provider_status = "⚡️" if stream_data.cached else "⏳"

        seeders_info = (
            f"👤 {stream_data.seeders}" if stream_data.seeders is not None else None
        )
        if episode_data and episode_data.size:
            file_size = episode_data.size
            size_info = f"{convert_bytes_to_readable(episode_data.size)} / {convert_bytes_to_readable(stream_data.size)}"
        else:
            file_size = stream_data.size
            size_info = convert_bytes_to_readable(stream_data.size)

        languages = (
            "🌐 " + " + ".join(stream_data.languages) if stream_data.languages else None
        )
        source_info = f"🔗 {stream_data.source}"

        primary_info = torrent_name if show_full_torrent_name else quality_detail
        secondary_info = " ".join(filter(None, [size_info, seeders_info]))

        description_parts = [
            primary_info,
            secondary_info,
            languages,
            source_info,
        ]
        description = "\n".join(filter(None, description_parts))

        stream_details = {
            "name": f"{settings.addon_name} {streaming_provider_name} {resolution} {streaming_provider_status}",
            "description": description,
            "behaviorHints": {
                "bingeGroup": f"{settings.addon_name.replace(' ', '-')}-{quality_detail}-{resolution}",
                "filename": file_name,
                "videoSize": file_size,
            },
        }

        if has_streaming_provider:
            base_proxy_url = base_proxy_url_template.format(stream_data.id) + (
                f"&season={season}&episode={episode}" if episode_data else ""
            )
            stream_details["url"] = base_proxy_url
            stream_details["behaviorHints"]["notWebReady"] = True
        else:
            stream_details["infoHash"] = stream_data.id
            stream_details["fileIdx"] = file_index
            sources = [
                f"tracker:{tracker}"
                for tracker in stream_data.announce_list or TRACKERS
            ]
            sources.append(f"dht:{stream_data.id}")
            stream_details["sources"] = sources

        stream_list.append(Stream(**stream_details))

    return stream_list


def convert_bytes_to_readable(size_bytes: int) -> str:
    """
    Convert a size in bytes into a more human-readable format.
    """
    if not size_bytes:
        return ""
    size_name = ("B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB")
    i = int(math.floor(math.log(size_bytes, 1024)))
    p = math.pow(1024, i)
    s = round(size_bytes / p, 2)
    return f"💾 {s} {size_name[i]}"


def convert_size_to_bytes(size_str: str) -> int:
    """Convert size string to bytes."""
    match = re.match(r"(\d+(?:\.\d+)?)\s*(GB|MB)", size_str, re.IGNORECASE)
    if match:
        size, unit = match.groups()
        size = float(size)
        return int(size * 1024**3) if "GB" in unit.upper() else int(size * 1024**2)
    return 0


def get_catalogs(catalog: str, languages: list[str]) -> list[str]:
    base_catalogs = ["hdrip", "tcrip", "dubbed", "series"]
    base_catalog = catalog.split("_")[-1]

    if base_catalog not in base_catalogs:
        return [catalog]

    # Generate the catalog for each supported language
    return [f"{lang.lower()}_{base_catalog}" for lang in languages]


async def parse_tv_stream_data(
    tv_streams: list[TVStreams], redis: Redis
) -> list[Stream]:
    stream_list = []
    for stream in tv_streams[::-1]:
        if settings.validate_m3u8_urls_liveness:
            is_working = await validate_m3u8_url_with_cache(
                redis, stream.url, stream.behaviorHints or {}
            )
            if not is_working:
                continue

        country_info = f"\n🌐 {stream.country}" if stream.country else ""

        stream_list.append(
            Stream(
                name=settings.addon_name,
                description=f"📺 {stream.name}{country_info}\n🔗 {stream.source}",
                url=stream.url,
                ytId=stream.ytId,
                behaviorHints=stream.behaviorHints,
            )
        )

    if not stream_list:
        stream_list.append(
            Stream(
                name=settings.addon_name,
                description="🚫 No streams are live at the moment.",
                url=f"{settings.host_url}/static/exceptions/no_streams_live.mp4",
                behaviorHints={"notWebReady": True},
            )
        )

    return stream_list


async def fetch_downloaded_info_hashes(
    user_data: UserData, user_ip: str | None
) -> list[str]:
    kwargs = dict(user_data=user_data, user_ip=user_ip)
    if fetch_downloaded_info_hashes_function := mapper.FETCH_DOWNLOADED_INFO_HASHES_FUNCTIONS.get(
        user_data.streaming_provider.service
    ):
        try:
            if asyncio.iscoroutinefunction(fetch_downloaded_info_hashes_function):
                downloaded_info_hashes = await fetch_downloaded_info_hashes_function(
                    **kwargs
                )
            else:
                downloaded_info_hashes = await asyncio.to_thread(
                    fetch_downloaded_info_hashes_function, **kwargs
                )

            return downloaded_info_hashes
        except Exception as error:
            logging.error(
                f"Failed to fetch downloaded info hashes for {user_data.streaming_provider.service}: {error}"
            )
            pass

    return []


async def generate_manifest(manifest: dict, user_data: UserData, redis: Redis) -> dict:
    from db.crud import get_genres

    resources = manifest.get("resources", [])
    manifest["name"] = settings.addon_name
    manifest["id"] += f".{settings.addon_name.lower().replace(' ', '')}"
    manifest["logo"] = settings.logo_url

    # Ensure catalogs are enabled
    if user_data.enable_catalogs:
        # Reorder catalogs based on the user's selection order
        ordered_catalogs = []
        for catalog_id in user_data.selected_catalogs:
            for catalog in manifest.get("catalogs", []):
                if catalog["id"] == catalog_id:
                    if catalog_id == "live_tv":
                        # Add the available genres to the live TV catalog
                        catalog["extra"][1]["options"] = await get_genres(
                            catalog_type="tv", redis=redis
                        )
                    ordered_catalogs.append(catalog)
                    break

        manifest["catalogs"] = ordered_catalogs
    else:
        # If catalogs are not enabled, clear them from the manifest
        manifest["catalogs"] = []
        # Define a default stream resource if catalogs are disabled
        resources = [
            {
                "name": "stream",
                "types": ["movie", "series", "tv"],
                "idPrefixes": ["tt", "mf"],
            }
        ]

    # Adjust manifest details based on the selected streaming provider
    if user_data.streaming_provider:
        provider_name = user_data.streaming_provider.service.title()
        manifest["name"] += f" {provider_name}"
        manifest["id"] += f".{provider_name.lower()}"

        # Include watchlist catalogs if enabled
        if user_data.streaming_provider.enable_watchlist_catalogs:
            watchlist_catalogs = [
                {
                    "id": f"{provider_name.lower()}_watchlist_movies",
                    "name": f"{provider_name} Watchlist",
                    "type": "movie",
                    "extra": [{"name": "skip", "isRequired": False}],
                },
                {
                    "id": f"{provider_name.lower()}_watchlist_series",
                    "name": f"{provider_name} Watchlist",
                    "type": "series",
                    "extra": [{"name": "skip", "isRequired": False}],
                },
            ]
            # Prepend watchlist catalogs to the sorted user-selected catalogs
            manifest["catalogs"] = watchlist_catalogs + manifest["catalogs"]
            resources = manifest["resources"]

    # Ensure the resource list is updated accordingly
    manifest["resources"] = resources
    return manifest


def is_contain_18_plus_keywords(title: str) -> bool:
    """
    Check if the title contains 18+ keywords to filter out adult content.
    """
    return ADULT_CONTENT_KEYWORDS.search(title) is not None


def calculate_max_similarity_ratio(
    torrent_title: str, title: str, aka_titles: list[str] | None = None
) -> int:
    # Check similarity with the main title
    title_similarity_ratio = fuzz.partial_ratio(torrent_title.lower(), title.lower())

    # Check similarity with aka titles
    aka_similarity_ratios = (
        [
            fuzz.ratio(torrent_title.lower(), aka_title.lower())
            for aka_title in aka_titles
        ]
        if aka_titles
        else []
    )

    # Use the maximum similarity ratio
    max_similarity_ratio = max([title_similarity_ratio] + aka_similarity_ratios)

    return max_similarity_ratio